Silencer
First Claim
1. A silencer for deadening sound from a sound source comprising:
- a sound receiver receiving sound from said sound source to thereby generate an electrical signal in accordance with the received sound;
signal converting means for converting the electrical signal generated by said sound receiver to an electrical signal corresponding to sound interfering with the sound to be received by said sound receiver so that the sound from said sound source is deadened by the effect of sound wave interference;
sound producing means for producing sound in accordance with the electrical signal generated by said signal converting means; and
a compartment for enclosing said sound source, said sound receiver and said sound producing means, said compartment being defined by side, bottom, ceiling, front and rear walls so that one of the dimensions of said compartment in the directions of the length, height and width thereof is set at a value larger than a wavelength of the sound to be deadened and the other dimensions thereof are set at respective values smaller than the wavelength of the sound to be deadened such that a standing wave of the sound to be deadened is composed only in said one direction, said compartment having a ventilating opening formed in a predetermined position of at least one of the walls defining the same, said ventilating opening being formed in a generally slender rectangular shape, a direction of a length of the ventilating opening intersecting perpendicularly the direction in which the standing wave of the sound travels in the compartment.
1 Assignment
0 Petitions
Accused Products
Abstract
A silencer for refrigerators includes a microphone receiving sound from a motor-compressor mounted in a machine compartment to thereby generate an electrical signal in accordance with the received sound, a signal converter converting the electrical signal generated by the noise receiver to an electrical signal for producing sound deadening the sound from the motor-compressor by the effect of sound wave interference, and a speaker for producing the sound based on the signal converted by the signal converter so that the sound interferes with the sound from the motor-compressor. The machine compartment is closed with a ventilating opening left opened. One of dimensions of the machine compartment in the three-dimensional directions is set at a value larger than those of the others so that a standing wave of the sound from the motor-compressor in the machine compartment is composed only in a primary mode in a low frequency range below 700 Hz. The ventilating opening is formed into a generally rectangular shape extending in the direction perpendicular to the direction that the standing wave travels.
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Citations
22 Claims
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1. A silencer for deadening sound from a sound source comprising:
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a sound receiver receiving sound from said sound source to thereby generate an electrical signal in accordance with the received sound; signal converting means for converting the electrical signal generated by said sound receiver to an electrical signal corresponding to sound interfering with the sound to be received by said sound receiver so that the sound from said sound source is deadened by the effect of sound wave interference; sound producing means for producing sound in accordance with the electrical signal generated by said signal converting means; and a compartment for enclosing said sound source, said sound receiver and said sound producing means, said compartment being defined by side, bottom, ceiling, front and rear walls so that one of the dimensions of said compartment in the directions of the length, height and width thereof is set at a value larger than a wavelength of the sound to be deadened and the other dimensions thereof are set at respective values smaller than the wavelength of the sound to be deadened such that a standing wave of the sound to be deadened is composed only in said one direction, said compartment having a ventilating opening formed in a predetermined position of at least one of the walls defining the same, said ventilating opening being formed in a generally slender rectangular shape, a direction of a length of the ventilating opening intersecting perpendicularly the direction in which the standing wave of the sound travels in the compartment. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A refrigerator comprising:
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a heat-insulative cabinet having a storage compartment therein and an evaporator provided therein so as to comprise a refrigerating cycle means; an outer casing provided on the top of the heat-insulative cabinet so as to define a cavity therein, said outer casing enclosing a motor-compressor comprising the refrigerating cycle means; a silencer for deadening sound generated by the motor-compressor, comprising a compartment defined by a partition wall in the cavity so as to have side, upper, bottom, front and rear walls, a sound receiver disposed with the motor-compressor in the compartment so as to receive sound generated by the motor-compressor to thereby generate an electrical signal in accordance with the received sound, signal converting means to convert the electrical signal generated by the sound receiver to an electrical signal to produce a sound to interfere with the sound received by the sound receiver, sound producing means provided in the compartment producing sound for deadening the sound from the motor-compressor by the effect of sound wave interference, and one of the dimensions of the compartment in the directions of the length, height and width thereof being set at a value larger than those of the others such that a standing wave of the sound to be deadened is composed only in said one direction. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification